Chromin Frame places the tab bar at the top of window, and replace the title bar and window frame bringing it closer to the Chrome look.
It's design to work with any theme.
Note from Mozilla: This add-on has been discontinued. Try Evernote instead.
Clipmarks lets you clip and share specific parts of articles, or anything else you read.
UberNote is a knowledge management tool enabling you to quickly store your content online from anywhere. Easily access your notes, clip web content, bookmark, and add notes with the browser toolbar. It's free, easy to use, and organizes your notes ...
Shows you a relevant Wikipedia article along with your search results. Clicking links in the article will trigger new Google searches, making it a very useful research tool...